import { VectorLike, VectorLikes } from '@use-gpu/core';
export type Lerpable = number | VectorLike | VectorLikes;
export type LerpableRecord = Record<string, Lerpable>;
export type Tracks<T extends LerpableRecord> = {
    [K in keyof T]: Keyframe<T[K]>[];
};
export type TrackTypes<T extends LerpableRecord> = {
    [K in keyof T]?: EaseType;
};
export type KeyframeTypeOf<T> = T extends Keyframe<infer E> ? E : never;
export type Ease = 'cosine' | 'linear' | 'hold' | 'bezier';
export type EaseType = 'mat4' | 'quat' | 'angle' | 'number';
export type MakeSpline<T> = (a: T, b: T, knots?: T[]) => Spline<T>;
export type AutoSpline<T> = (a: T, b: T, c: T, d: T) => T[];
export type Spline<T> = (target: T, t: number) => T;
export type Lerp<T> = (target: T, a: T, b: T, t: number) => T;
export type Measure<T> = (a: T, b: T) => number;
export type EaseTypeImpl<T> = {
    spline: MakeSpline<T>;
    auto: AutoSpline<T>;
    lerp: Lerp<T>;
    measure: Measure<T>;
};
export type Keyframe<T extends Lerpable> = {
    time: number;
    value: T;
    ease?: Ease;
    bezier?: number[];
    knots?: T[];
};
export type AutoKeyframe<T extends Lerpable> = {
    time: number;
    value: T;
    speed?: number;
    in?: number;
    out?: number;
    knots?: T[];
};